I thought about this and came to the conclusion that it is impossible to give your coins after death without trusting someone other than yourself.
You are either:
  • transferring the coins too early or too late with an automated transaction
  • trusting your children won't take your coins before you die
  • trusting a custodian
  • trusting a lawyer
  • even with instructions written in a sealed written will, someone besides you needs to know about the will's existence and where it is